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The word act, as used in the term Act of Congress, is a common, not a proper noun. The capitalization of the word act is deprecated by some dictionaries and usage authorities. Some writers, in particular the U.S. Code, capitalize Act.
Best Answer: Congress should be capitalized when it refers to the Senate and the House of Representatives (or to a congress of another government). However, when congress refers to a generic group, do not capitalize it. (There are other uses of congress, too, but I'm sticking to the point in your question.